Dresden 2017 – wissenschaftliches Programm
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DF: Fachverband Dielektrische Festkörper
DF 17: Ferroics - Domains, Domain Walls and Skyrmions IV
DF 17.4: Vortrag
Donnerstag, 23. März 2017, 10:45–11:00, WIL B321
Dielectric properties of organic charge-transfer salts — •Jonas K. H. Fischer1, Peter Lunkenheimer1, Rudra Manna2, Harald Schubert3, Michael Lang3, Jens Müller3, Stephan Krohns1, John A. Schlueter4, Cecile Mézière5, Patrick Batail5, and Alois Loidl1 — 1Experimental Physics V, EKM, University of Augsburg, Augsburg, Germany — 2Experimental Physics VI, EKM, University of Augsburg, Augsburg, Germany — 3Phys. Inst. Univ. Frankfurt, SFB/TR 49, Frankfurt, Germany — 4Materials Research, National Science Foundation, Arlington, Virginia, United States — 5Laboratoire MOLTECH, UMR 6200 CNRS-Université d’Angers, Bt. K, UFR Sciences, Angers, France
The EDT-TTF-based charge-transfer salts have attracted considerable attention due to their intriguing dielectric properties [1].
An example is κ-(BEDT-TTF)2Cu[N(CN)2]Cl, which exhibits multiferroicity [2]. Its polar moment was suggested to arise from molecular dimerization, combined with charge order. Other interesting recent examples include α-(BEDT-TTF)2I3, which shows the signature of relaxor-ferroelectric behavior [1].
Here, we will present an overview of the dielectric properties of the above systems and provide new results on κ-(BEDT-TTF)2Hg(SCN)2Cl, which also seems to show ferroelectric behavior in its charge-ordered state. In addition, we present measurements of δ-(EDT-TTF-CONMe2)2Br. This compound lacks dimerization, but exhibits charge order already at room temperature.
P. Lunkenheimer and A. Loidl, J. Phys.: Condens. Matter 27, 373001 (2015).
[2] P. Lunkenheimer et al., Nat. Mater. 11, 755 (2012).